18877660853 has 2 divisors, whose sum is σ = 18877660854. Its totient is φ = 18877660852.

The previous prime is 18877660801. The next prime is 18877660877. The reversal of 18877660853 is 35806677881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9931716964 + 8945943889 = 99658^2 + 94583^2 .

It is a cyclic number.

It is not a de Polignac number, because 18877660853 - 2⁸ = 18877660597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18877660792 and 18877660801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18877660253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9438830426 + 9438830427.

It is an arithmetic number, because the mean of its divisors is an integer number (9438830427).

Almost surely, 2^18877660853 is an apocalyptic number.

It is an amenable number.

18877660853 is a deficient number, since it is larger than the sum of its proper divisors (1).

18877660853 is an equidigital number, since it uses as much as digits as its factorization.

18877660853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 18877660853 in words is "eighteen billion, eight hundred seventy-seven million, six hundred sixty thousand, eight hundred fifty-three".